Hulu recently pulled an interesting stunt. The've been running WGN's "Manhattan" series, about the original A-bomb program. Anyone could watch it free, with ads, after a few days.
Then, for the final episode, they forced people to register with Hulu or sign in with Facebook to see the episode. Their message says "This video is intended for mature audiences. Use your Facebook or free Hulu account to continue." I checked with WGN. Hulu is lying; the last episode is not for "mature audiences". WGN says they'll try to get Hulu to fix it, but it's been over a week and it hasn't been fixed.
Hulu is learning from the cable companies how to put their boot on the user's face.